#!/bin/bash

# Get full user name of current user
# E.g. "Robbie Hanson"
full1=$(dscl -plist . read /Users/$USER RealName | awk -F '</*string>' '/string>/{print ""$2""}')
#echo $full1

# Convert to lower case
# E.g. "robbie hanson"
full2=$(echo $full1 | awk '{print tolower($0)}')
#echo $full2

# Replace spaces with underscores
# E.g. "robbie_hanson"
full3=$(echo ${full2// /_})
#echo $full3

# Remove any characters that are illegal in a macro name
full4=$(echo $full3 | sed 's/[^0-9a-zA-Z_]*//g')
#echo $full4

# If blank, set the name to an anonymous user
if [ "$full4" == "" ]
then
	full4='anonymous_user'
fi

# If we output directly to our intended file, even when nothing has changed,
# then we'll essentially be doing a touch on the file.
# The compiler will see this, and recompile any files that include the header.
# This may mean recompiling every single source file, every single time we do a build!
# So instead we're going to output to a temporary file, and use diff to detect changes.

temp_filepath="${SRCROOT}/Logging/LumberjackUser.temp.h"
final_filepath="${SRCROOT}/Logging/LumberjackUser.h"

echo "// This file is automatically generated" > ${temp_filepath}
echo "#define $full4 1" >> ${temp_filepath}

if [ -a ${final_filepath} ]
then
	DIFF=$(diff ${temp_filepath} ${final_filepath}) 
	if [ "$DIFF" != "" ] 
	then
		cp -f ${temp_filepath} ${final_filepath}
	fi
else
	cp -f ${temp_filepath} ${final_filepath}
fi